Hanbell RC2-F Series, Руководство пользователя, Страница: 77 / 117

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* Specification of stop valve
Maximum working pressure Hydrostatic pressure test Refrigerant Temperature range
28 kg / cm² G 42 kg / cm² G HFC, HCFC

40˚C~150˚C
c. Suction and discharge check valve
Hanbell designs a complete series of suction and discharge check valves for customer’s application. Suction
check valves are widely used in the refrigeration system (SST< -10
℃
) or system which has big pressure
differential between suction and discharge side. With the help of suction check valve, it can help to reduce the
reversal run time after compressors stop to protect bearings. For a parallel system, a discharge check valve on
the oil separator outlet is necessary. With an additional suction check valve installed on each compressor, it can
help to separate the suction pressure from discharge pressure if a common oil separator is used in the system.
Besides, suction check valve can prevent the unwanted refrigerant enters the suction port of non working
compressor because of head of height (potential energy).
The inner structure of suction check valve is opposite to the inner structure of discharge check valve which you
can see from the figures below. Users can contact Hanbell representative to get more information on the suction
and discharge check valves.
d. Oil temperature sensor
Oil temperature sensor is used to detect the oil temperature and control the oil heater. When oil temperature
reaches the setting value, oil heater will be off to save the energy. The oil heater and temperature sensor operate
with each other regardless whether the compressor is operating or not. Hanbell recommends keeping oil
temperature above 30
℃
for a safe and easy start-up.
e. Oil level switch
Hanbell recommends installing an oil level switch on the external oil separator to ensure oil supply to the
compressor. To prevent from oil level switch trip caused by oil foaming or surging in the sump, a time delay
around 15 ~ 30 seconds is recommended before shut down the compressor.
Suction check valve Discharge check valve